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Shikonin inhibited the proliferation of QBC939 cells. Cultured QBC939 cells were incubated with an increasing dose of Shikonin (0 to 10 µM) for 24, 48, and 72 h, and cell viability was assessed using the 3-(4,5-dimethylthiazol-2-yl) -2,5-diphenyltetrazolium assay.
